recovery. The system was operated at low duty cycle, 2Hz with 60 pC bunch charge with a 200 microsecond macropulse, while we continue to improve the transport prior to allowing cw operation. While in the energy recovery mode, we doubled the drive laser operating frequency to 37 MHz and lased with a macropulse current (2 mA) that was twice the supplied current limit in the non-recovered mode (1 mA).

Last night on swing shift we set up all the beam loss monitors (BLMs) in the recirculation system and added these to the MPS so that we are now properly configured to move to cw operation. We have measured and adjusted the beam transport properties of the straight return leg which shows as expected minimal dispersion. During the first shift operation today we worked to adjust the quad telescope and dump raster magnet in the recirculation dump for minimal beam loss. Over the weekend and into next week we intend to continue the task of improving transport to the point where we would allow cw operation and a subsequent demonstration of cw lasing with energy recovery. At this point we are planning to cease operations near the middle of next week to allow preparations for the FEL Conference (which begins on Aug. 16th). We will not operate during the conference and use this period for gun refurbishment.